Results and Discussion

From the different carbon sources tested cane juice shows the best growth and the highest rate of nitrogenase activity for the studied strains. Also their capacity of growth and N2 fixation at low concentrations of hormones demonstrate that they are able to improve the benefits to the plant. The analysis of positive and negative interactions among endophytic community members in sugarcane contributes to enhance their effect in this important graminaceous crop.

Figure 1. Effect of AIA and GA on nitrogenase activity in G. diazotrophicus and E. agglomerans.